This is purely anecdotal evidence. I'm a fitness guy. I'm a pretty big guy. I played football in high school and then in college. I go to the gym seven days a week (twice a day M-F). During the times I smoked cigs, I had to change the way I worked out to accommodate the impact they had on my cardiovascular performance. I struggled when running and lost my breath and endurance during weigh training. I quit for over a year completely and got back into great shape. I relapsed and smoked a pack of cigs. Instead of buying a second pack, I bought a bunch of vaping stuff. I've been vaping HARD for over a month. It hasn't impacted my performance at all. I'm actually shocked. I still do my three mile runs with no problem. My heart rate returns to normal quickly. I'm not gasping for air. I notice no difference during weight training.
Again, this is all anecdotal, but vaping is not even close to cigarettes. I'm sure there are negative impacts on the body and lungs, but it's nothing like cigs.